Percentage Increase Calculator
Instantly calculate the percentage growth, decrease, or change between any two values. Perfect for finance, academics, and everyday math.
Calculate Percentage Change
Enter your starting value and your final value below to instantly see the percentage difference and absolute change.
Percentage Calculator
Enter your values below to find the percentage change.
The Formula
How percentage change is calculated
Find the Difference
Subtract the Original Value from the New Value: New - Original
Divide by Original
Divide that difference by the absolute Original Value.
Multiply by 100
Multiply the result by 100 to get the percentage. A positive result is an increase, negative is a decrease.
When to Use a Percentage Calculator
Understanding percentage change is vital across many everyday and professional scenarios.
| Scenario | Original Value | New Value | Result |
|---|---|---|---|
| Salary Raise | £30,000 | £33,000 | +10% Increase |
| Sale Discount | £80 | £60 | -25% Decrease |
| Investment Growth | £1,000 | £1,150 | +15% Increase |
| Population Change | 50,000 | 52,500 | +5% Increase |
| Weight Loss | 80 kg | 72 kg | -10% Decrease |
Percentage Calculator FAQ
Answers to the most frequently asked questions about calculating percentage change and growth.
The formula for percentage increase is: ((New Value – Original Value) / Original Value) × 100. If the result is positive, it is an increase; if negative, it is a decrease.
To calculate a 20% increase, multiply the original number by 1.20. For example, a 20% increase on 50 is 50 × 1.20 = 60.
Yes. A negative percentage increase simply indicates a percentage decrease. For example, a -15% increase means the value has decreased by 15%.
You cannot calculate a percentage increase or decrease from zero, as it would require dividing by zero, which is mathematically undefined. The calculator will show the absolute difference instead.